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MT48LC8M16A2FB-7E Datasheet(PDF) 12 Page - Micron Technology |
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MT48LC8M16A2FB-7E Datasheet(HTML) 12 Page - Micron Technology |
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12 / 59 page  12 128Mb: x4, x8, x16 SDRAM Micron Technology, Inc., reserves the right to change products or specifications without notice. 128MSDRAM_E.p65 – Rev. E; Pub. 1/02 ©2001, Micron Technology, Inc. 128Mb: x4, x8, x16 SDRAM TRUTH TABLE 1 – COMMANDS AND DQM OPERATION (Note: 1) NAME (FUNCTION) CS# RAS# CAS# WE# DQM ADDR DQs NOTES COMMAND INHIBIT (NOP) H XXXX X X NO OPERATION (NOP) L H H H X X X ACTIVE (Select bank and activate row) L L H H X Bank/Row X 3 READ (Select bank and column, and start READ burst) L H L H L/H8 Bank/Col X 4 WRITE (Select bank and column, and start WRITE burst) L H L L L/H8 Bank/Col Valid 4 BURST TERMINATE L H H L X X Active PRECHARGE (Deactivate row in bank or banks) L L H L X Code X 5 AUTO REFRESH or SELF REFRESH L L L H X X X 6, 7 (Enter self refresh mode) LOAD MODE REGISTER L L L L X Op-Code X 2 Write Enable/Output Enable –––– L – Active 8 Write Inhibit/Output High-Z –––– H – High-Z 8 following the Operation section; these tables provide current state/next state information. Commands Truth Table 1 provides a quick reference of available commands. This is followed by a written description of each command. Three additional Truth Tables appear NOTE: 1. CKE is HIGH for all commands shown except SELF REFRESH. 2. A0-A11 define the op-code written to the mode register. 3. A0-A11 provide row address, and BA0, BA1 determine which bank is made active. 4. A0-A9; A11 (x4); A0-A9 (x8); or A0-A8 (x16) provide column address; A10 HIGH enables the auto precharge feature (nonpersistent), while A10 LOW disables the auto precharge feature; BA0, BA1 determine which bank is being read from or written to. 5. A10 LOW: BA0, BA1 determine the bank being precharged. A10 HIGH: All banks precharged and BA0, BA1 are “Don’t Care.” 6. This command is AUTO REFRESH if CKE is HIGH, SELF REFRESH if CKE is LOW. 7. Internal refresh counter controls row addressing; all inputs and I/Os are “Don’t Care” except for CKE. 8. Activates or deactivates the DQs during WRITEs (zero-clock delay) and READs (two-clock delay). |
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